Throttle



Jun 14, 1932. HPPY 1,863,068

THROTTLE Filed June 19. 1929 $1172 INVENTOR.

By d" A TTORNE Y.

Patented June 14;, 1932 v UNITED STATES PATENT OFFICE GEORGE F. PIPPY,OF EAST ORANGE, NEW JERSEY, ASSIGNOR T AIIIERICAN THROTTLE COMPANY INC.,OF NEW YORK, N. Y.

THROTTLE Application filed June 19,

The invention relates to throttles of the multiple type and has for itspurpose the pro vision of a more desirable form of devices of thisclass.

The invention is illustrated in the accompanying drawing in which Fig. 1represents a fragmentary transverse sectional view of a superheaterheader arranged in a locomotive smoke-box with my invention applied;Fig.

w 2 shows an enlarged sectional view on line 22 of Fig. 1 and Fig. 3shows a view similar to that of Fig. 1 of a modification.

I have shown my invention applied to a throttle arrangement of a formwhich has gone into wide use and shall briefly describe the generalarrangement as far as its features are old.

The smoke-box shell is shown in cross-secvtion at 1, 2 being theordinary fines carrying the hot products of combustion from the fire boxinto the smoke-box only a few of the top row of these fines are shown.Within these flues are placed the tubular superheater elements or units3 whose ends 4 are secured to the under side of the superheater header5.

Steam is delivered by these superheater elements in superheatedcondition into the top chamber 6 of the front portion of the superheaterheader. This chamber 6, as well as the chambers lying below it andpresently to be further referred to, are preferably made integral withthe superheater header although this is not essential. The chambers justreferred to are the intermediate chamber 7 and the lowest chamber 8. Theintermediate chamber 7 is separated from the upper chambers 6 by thepartition 9 and from the bottom chamber 8 by the partition 10. Thepartition 9 has a series of ports 11 preferably arranged in a straightline as will be clear from the figure. Aligned with each port 11 is acircular opening 12 in the lower partition 10. In the top wall 13 andaligned with the ports 11 are the openings 1 1, closed by the caps 15,each of which has formed in it a cylindrical space 16. These caps areheld removably in place by screws. or studs and nuts. 17. Thecylindrical spaces 16 are accurately aligned with the ports 11 and thecylindrical openings 12.

Each port 11 is controlled by a valve 18 1929. Serial No. 372,023.

which has a downwardly extending stem 19 and an upwardly extending stem20. The stem 20 has on its upper end a piston 21 fitting with a certainamount of clearance in the cylinder 16. The lower end of the stem 19 isequipped with a piston fitting in and reciprocating in cylindricalopening 12. Heretofore in constructions of this type this piston was asingle integral with the valve 18 and stem 19. This is changed by myinvention as will be described later on. The piston has in the past beenprovided with a downward extension which feature is retained in myconstruction and appears at 22. It has, as will appear more clearly fromthe inspection of Fig. 1, the shape of a stirrup and is engaged by thecam 23 fixed to the shaft 24:.

It will be understood that while in the pre ceding description referencehas been made at times to only a single valve, the same descriptionapplies to the others.

The shaft 24 can be rotated or rocked by means of the arm 25 fixed onthe end of shaft 24 which for this purpose extends to the outside of thesmoke-box through a stufling box 26, the end of said arm havingconnected to it the throttle rod 27 which extends back to the cab.

The space 6 is directly connected to the space 8 through a small port28, controlled by a pilot valve 29 and the passage 30. The pilot valveis actuated by means of the cam 31 also fixed on the shaft 24.. Thispilot valve is equipped at its top with a stem 32 and a piston 33reciprocating in the cylindrical space 34 of cap 35.

From space 7 two steam pipes (only one of them showing at 36) lead tothe steam chest and engine in the ordinary way. The action of the devicedescribed above may be briefly stated as follows: The superheated steamdelivered to the space 6 is prevented by the valves 18 from flowing tothe pipes 36 and so to the steam chests. Steam that has leaked past thepistons 21 into the spaces 16 and exerts pressure on the upper side ofthe piston keeps the valves seated. The upward. pressure on the underside of the pistons is counterbalanced by the downward pressure on thevalves. lVhen the engineer wishes to admit steam to the steam chests heoperates the throttle lever thereby turning the shaft 24 in thedirection to move the cams 23 upward. These cams are so arranged on theshaft 2% that the cam 31 opens the pilot valve 29 before the remainingcams engage their associated valves. The opening of the pilot valve 29admits steam into the lowest chamber 8.. This balancing steam admittedinto the chamber 8 put the valves into a balanced condition by exertingupward pressure onthe lower sides of the pistons reciprocating in theopenings 12 offsetting the downward pressure onpis tons 21. The cams 23can thereafter easily raise the Valves 18 from their seats. The purposeof the pistons 21 is to damp any tendency of the valves to reciprocaterapidly especially when they are slightly open. This feature does notform a part of the present invention; i

The present invention relates, as sug estedabove, to the pistonsreciprocating in t is cy' lindrical openings 12. When the valves aremade integral, including the pistons, they can not be ground to theirseats while the cams 23 lie within the openings of the stirrups. Thisstirrup arrangement is preferable toany other means so far devised foractuating the valves. I have, therefore, devised the presentconstruction with the idea of retaining this desirable feature and yetmake it possible to grind the valves to their seats, keeping the cams inplace. It will be .understood that it is highly desirable tobe able toeffect this grinding without being compelled to move the cams out oftheir slots in the stirrup by turning the shaft 24.

The means for effecting this are as follows: The lower end of stem 19carries the threaded head 38 to whichisscrewed the cap 39. This cap hastwo steps 40 and 40a, the former of which engages the'bottom of head 38.The stirrup 22 is provided at its upper end with a cylindrical portion37 a, extending through a corresponding opening in cap 39, and anenlarged cylindrical portion or head 37 whose lower annular face liesagainst the shoulder or step 40-61. The vertical height of the head 37is somewhat smaller than the vertical distance between the step.40a andthe bottom of 38, and the fit of the head in the cap is loose.

As a result the valve 18 together with its connected parts can be turnedfor the purpose *of grinding it on its seat while the portion 37 and thestirrup 22 are kept from turning by the cam 23. The grinding is effectedin the usual way by means of a tool engaging the,

holes 41 or any other preferred way.

In the modification shown in Fig. 3 cylinder 39V is made integral withthe stirrup 22 and has extending upward from it an inverted-U structureor bridge 42. This bridge 42 has an opening in its upper face throughwhich extends the extension 43 of the shaft 2 19. A shoulder 44 on theshaft engages the upper face of the bridge while the lower end of 43 isthreaded and carries the nut 45. Enough play is left between shouldert land nut 45 so that the valve 18 can be turned without turning the piston39'.

Other advantages besides the possibility of easy grinding as abovedescribed results from my improvement. Thus it is possible where desiredto make the valve of different material from the piston 39. Moreover thecombined structure of the two pistons and the valve has more flexibilitythan when the entire structure is made unitary. The valves thereforeseat with greater ease and certainty.

I claim:

1. In apparatus of the class described, the combination of a casinghaving two partitions dividing the interior into an intermediate and twoouter chambers, said partitions each having a port, the two ports beingalined with each other, a disk valve controlling one of the ports andopening toward one of the outer chambers, a piston reciprocable in theother port, a slotted stem connected to and extending from the-pistoninto the second outer chamber, an intermediate stem connecting theval'veto the piston, the connection between one of the stems and 'the pistonbeing by a swivel joint permittingrelative rotary motion and no materiallongitudinal motion, and an operating cam extending into the slot;whereby the valve can be positively raised and lowered by means of thecam and can be rotated without the removal of the cam from the slot.

2. The apparatus according to claim 1, the swivel joint being betweenthe piston and the lower stem.

3. The apparatus according to claim 1, the

swivel joint being between the piston and the

